Lab Calculators — LabVerse

🩸Corrected WBC Count 🔄Absolute Reticulocyte & RPI 🔴RBC Indices (MCV/MCH/MCHC) ⚖️Anion Gap 🦴Corrected Calcium 🧮Creatinine Clearance 💧Serum Osmolality 📏BSA & BMI 🧪Dilution Calculator

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Corrected WBC Count

Corrects the total leukocyte count for the presence of nucleated red blood cells (nRBCs) seen on the peripheral smear.

Uncorrected WBC (×10³/µL)

nRBCs per 100 WBC

Corrected WBC = (Uncorrected WBC × 100) ÷ (100 + nRBC per 100 WBC)

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Absolute Reticulocyte Count & Reticulocyte Production Index

Converts a reticulocyte percentage into an absolute count and, using the patient's hematocrit, an RPI that reflects true marrow response to anemia.

Reticulocyte (%)

RBC count (×10⁶/µL)

Patient Hematocrit (%)

Absolute Retic = (Retic % ÷ 100) × RBC count
RPI = [Retic % × (Patient Hct ÷ 45)] ÷ Maturation Correction Factor

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RBC Indices — MCV, MCH, MCHC

Calculates the three red cell indices from hemoglobin, hematocrit and RBC count — the core of anemia classification.

Hemoglobin (g/dL)

Hematocrit (%)

RBC count (×10⁶/µL)

MCV = (Hct ÷ RBC) × 10 | MCH = (Hb ÷ RBC) × 10 | MCHC = (Hb ÷ Hct) × 100

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Anion Gap

Used to help classify metabolic acidosis into high anion-gap vs. normal anion-gap categories.

Sodium (mEq/L)

Chloride (mEq/L)

Bicarbonate (mEq/L)

Anion Gap = Na⁺ − (Cl⁻ + HCO₃⁻) | Normal range: 8–16 mEq/L

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Corrected (Albumin-Adjusted) Calcium

Adjusts total serum calcium for low albumin, since roughly 40% of calcium circulates bound to albumin.

Measured Total Calcium (mg/dL)

Serum Albumin (g/dL)

Corrected Ca = Measured Ca + 0.8 × (4.0 − Serum Albumin)

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Creatinine Clearance (Cockcroft-Gault)

Estimates creatinine clearance as a marker of glomerular filtration rate.

Age (years)

Weight (kg)

Serum Creatinine (mg/dL)

Sex

CrCl = [(140 − Age) × Weight(kg) × (0.85 if female)] ÷ (72 × Serum Creatinine)

Educational estimate only — not a substitute for clinical judgment or a validated eGFR equation.

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Calculated Serum Osmolality & Osmolar Gap

Estimates serum osmolality from sodium, glucose and BUN, and compares it against a measured value if available.

Sodium (mEq/L)

Glucose (mg/dL)

BUN (mg/dL)

Measured Osmolality (optional, mOsm/kg)

Osmolality = 2 × Na⁺ + (Glucose ÷ 18) + (BUN ÷ 2.8)

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Body Surface Area & BMI

Two common anthropometric calculations — BSA (Mosteller formula) is used for drug dosing references; BMI screens for weight categories.

Height (cm)

Weight (kg)

BSA (Mosteller) = √[(Height cm × Weight kg) ÷ 3600]
BMI = Weight(kg) ÷ Height(m)²

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Dilution Calculator (C₁V₁ = C₂V₂)

Solves for any one unknown in a simple dilution — the calculation used constantly for reagents, standards and manual cell counts.

Initial Concentration (C₁)

Initial Volume (V₁)

Final Concentration (C₂)

Final Volume (V₂)

C₁ × V₁ = C₂ × V₂ — leave exactly one field blank to solve for it